[PATCH 3/3] mailbox: sophgo: add mailbox driver for cv18x SoCs

[kernel test robot]

Hi Yuntao,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master v6.10-rc4 next-20240620]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Yuntao-Dai/dt-bindings-mailbox-add-Sophgo-cv18x-SoCs-mailbox/20240618-232307
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/SYBP282MB2238F93AB57A398E322644C3C4CE2%40SYBP282MB2238.AUSP282.PROD.OUTLOOK.COM
patch subject: [PATCH 3/3] mailbox: sophgo: add mailbox driver for cv18x SoCs
config: powerpc-randconfig-r121-20240621 (https://download.01.org/0day-ci/archive/20240621/202406212145.yo80iIS0-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20240621/202406212145.yo80iIS0-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202406212145.yo80iIS0-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/mailbox/cv1800b-mailbox.c:66:25: sparse: sparse: cast removes address space '__iomem' of expression
   drivers/mailbox/cv1800b-mailbox.c:85:22: sparse: sparse: cast removes address space '__iomem' of expression
>> drivers/mailbox/cv1800b-mailbox.c:87:21: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void volatile [noderef] __iomem *d @@     got unsigned long long [usertype] *addr @@
   drivers/mailbox/cv1800b-mailbox.c:87:21: sparse:     expected void volatile [noderef] __iomem *d
   drivers/mailbox/cv1800b-mailbox.c:87:21: sparse:     got unsigned long long [usertype] *addr

vim +/__iomem +66 drivers/mailbox/cv1800b-mailbox.c

    51	
    52	static irqreturn_t cv1800b_mbox_irq(int irq, void *dev_id)
    53	{
    54		struct cv1800b_mbox *mbox = (struct cv1800b_mbox *)dev_id;
    55		u8 set, valid;
    56		u64 *addr;
    57		size_t i;
    58	
    59		set = readb(mbox->mbox_base + MBOX_SET_INT_REG(mbox->recvid));
    60	
    61		if (!set)
    62			return IRQ_NONE;
    63	
    64		for (i = 0; i < MAILBOX_MAX_CHAN; i++) {
    65			valid = set & (1 << i);
  > 66			addr = (u64 *)(mbox->mbox_base + MAILBOX_CONTEXT_OFFSET) + i;
    67			if (valid) {
    68				mbox->content[i] = addr;
    69				writeb(valid, mbox->mbox_base +
    70						      MBOX_SET_CLR_REG(mbox->recvid));
    71				writeb(~valid,
    72				       mbox->mbox_base + MBOX_EN_REG(mbox->recvid));
    73				return IRQ_WAKE_THREAD;
    74			}
    75		}
    76	
    77		return IRQ_NONE;
    78	}
    79	
    80	static int cv1800b_mbox_send_data(struct mbox_chan *chan, void *data)
    81	{
    82		struct cv1800b_mbox *mbox = dev_get_drvdata(chan->mbox->dev);
    83		int idx = (int)chan->con_priv;
    84		u8 en, valid;
    85		u64 *addr = (u64 *)(mbox->mbox_base + MAILBOX_CONTEXT_OFFSET) + idx;
    86	
  > 87		memcpy_toio(addr, data, 8);
    88	
    89		valid = 1 << idx;
    90		writeb(valid, mbox->mbox_base + MBOX_SET_CLR_REG(mbox->sendto));
    91		en = readb(mbox->mbox_base + MBOX_EN_REG(mbox->sendto));
    92		writeb(en | valid, mbox->mbox_base + MBOX_EN_REG(mbox->sendto));
    93		writeb(valid, mbox->mbox_base + MBOX_SET_REG);
    94	
    95		return 0;
    96	}
    97	

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